Earth working implement



R. K. REYNOLDS EARTH WORKING IMPLEMENT Sept. 24, 1963 5 Sheets-Sheet 1 Filed Jan. 3, 1961 INVENTOR. .414 71. @Iw/L/S Sept. 24, 1963 R. K. REYNOLDS 3,104,480 i EARTH WORKING IMPLEMENT Filed Jan. 5, 1961 5 Sheets-Sheet 2 Sept. 24, 1963 R. K. REYNOLDS EARTH WORKING IMPLEMENT 5 Sheets-$heet 3 Filed Jan. 3, 1961 Sept. 24, 1963 R. K. REYNOLDS 3,104,480

EARTH WORKING IMPLEMENT Filed Jan. 3, 1961 5 Sheets-Sheet 4 INVEN TOR.

p 1963 R. K. REYNOLDS 3,104,480

EARTH WORKING IMPLEMENT Filed Jan. 3, 1961 5 Sheets-Sheet 5 INVEN TOR. 511a W A. Jig/720% iOMIL l +9 mol w I l L l V United States Patent 3,104,480 EARTH WORKING IMPLEMENT Ralph K. Reynolds, Des Plaines, 111., assignor to International Harvester Company, Chicago, 111., a corporation of New Jersey Filed Jan. 3, 1961, Ser. No. 80,414 12 Claims. (Cl. 37117.5)

This invention rel-ates to improvements in earthworking vehicles and more in particular relates to earthworking implement means [for performing earth scraping, loading, and dozing operations.

It is therefore a general object of this invention to provide an improved earthworking implement for earthworking vehicles.

It is another general object of this invention to provide [an earthworking vehicle having an earthworking implement constructed to perform dozing and earth scraping operations.

A further object of this invention is to provide a crawler tractor having 'a front end scraper bowl for filling the tractor with a load and having ejector means for subsequent removal of the load therefrom.

It is a further object of this invention to provide for a crawler tractor having a scraper bowl, a dozer element for performing dozing operations in conjunction with earth scraping operations.

Another object of this invention is to provide an earthworking vehicle with a scraper bowl and a scraper apron for opening and closing the bowl to \a load wherein the outer portion of the apron provides a moldboard or dozer unit for performing dozing operations.

It is a further object of this invention to provide an earthworking vehicle having a scraper bowl, the forward portion of which comprises a movable apron for opening the bowl to a load and wherein said rapron oomprises a forward moldboard or dozer portion, a portion of which is swingahle into a raised position for adding strength to the apron in a working position thereof.

Still a further object of this invention is to provide a scraper mold board apron unit having a rearward face for closing a scraper bowl and a forward face having a moldboard contour.

It is a further object of this invention to provide a scraper bowl for an earthworking vehicle wherein the bowl has an open end closable lay a movable scraper apron having a forwardly facing moldboard portion wherein the apron may be locked in the moldboard operating position in closing said bowl or raised for performing earth scraping operations when the moldboard portion is locked in van out-of-iuse position.

These and other objects will become apparent from reference to the following drawings and description which portray ran operable arrangement of my novel device without placing any limitation on the breadth or scope of the appended claims, wherein:

FIGURE 1 is a side elevation-a1 view of the novel implemented earthworking vehicle;

FIGURE 2 is a front elevational view of the earthworking vehicle with the dozer unit in a lowered position;

FIGURES 3 to 7 are perspective views looking down from various angles at the earthworking vehicle and showing the construction, arrangement, and functional operations of the various implements that are formed with and are part of the vehicle;

FIGURE 8 is a plan view of the novel implemented earthworking vehicle;

FIGURE 9 is a side elevational view of the vehicle with the front portion partly in section; and

FIGURE is a front elevational view of the vehicle with the dozer unit in a raised position.

With reference to my three co-pending patent applica tions having U.S. Serial Nos. 80,413; 80,449; 140,237, and filing dates of January 3, 1961; January 3, 1961; September 25, 1961, respectively; and to the FIGUR'ES 1 through 10 of the accompanying drawings, there is shown a vehicle 1 of the crawler tractor type having a body 2 and a plurality of ground traversing members or wheels 3, 4, 5 and 6 on either (left or right) side 7, 7a of the vehicle 1 driven by sprocket 8, the members on one side of the vehicle being encircled by track 9 and the memhers on the other side of the vehicle being encircled by the track 10 and interconnecting linkage 1-1 on the mechanism 1 between each of the members *3, 4, 5 and 6 and the body 2 of the vehicle 1 are so constructed as to allow relative movement between the body or frame 2 and between each wheel 3, 4, 5 and 6 such that the movement of each wheel 3, 4, 5 and 6 is independent or may be made independent of the movement of every other wheel 3, 4, 5 and 6 relative to the hody 2. The body 2 consists of a rectangular framework 12 having panel sides 13, 14, .a rear side 15, and a forward-1y disposed movable side 16 and a bottom or lower portion 17 at the front part 18 of the vehicle or tractor 2. The structural features of this framework will 'be discussed in greater detail hereafter.

It is to be noted that such expressions as front end or part or rear end or part are merely chosen to provide a geographic location and it will be understood that these expressions are intended to merely locate the operating end of the vehicle 2 regardless of the direction in which the vehicle 2 is traveling.

The engine designated as 19 is located in the rearward portion 20 of the tractor 2 as are located all of the controls '21 for operating the vehicle 2. Alongside of the engine structure 19 located on platform 24 are the operators seat 23 and windshield 22.

Forward of the platform 24 is the scraper bowl 25 formed by the forward ends 26, 27 of the side members 13, 14, the forward movable wall or apron 16, the floor 17 and the forward end of the platform 24. Reciprocal between the apron 16 and the platform 24 within the howl 25 is the movable ejector gate 28 having a hydraulioally operated ram unit 29 for ejecting loads from the bowl 25. S ponsons or ejector guide tracks 30, 3-1 flanked each inside and outside portion of the side walls 13, 14 over which ride inside bowl 25 extensions 32, 33 of the ejector28 and have forwardly downwardly extending structures or ramps 34, 35 joining with the forward downward sloping end 36 of the bowl floor 17 to form a scraper bowl cutting edge 37. The inwardly facing vertical side surfaces 38, 39 of the lower side portions 38a, 39a of side walls 13, 14, the depending central portion 40 of the ejector gate 28, the floor 17, and inside concave surface 41 of the apron 16 form the lower or depressed bowl areaway 42 which at its forward end merges into the scraper cutting edge 37.

The scraper bowl 25 at the front end 18 of the tractor 1 is integral with the body framework or housing 12 so that when the body 2 is moved or tilted relative to the wheels 3, 4, 5 and 6 by the hydraulically operated linkage 11 between the wheels 3, 4, 5 and 6 and the body 2, the scraper edge 37 is also moved or tilted relative to the ground to cut the earth and fill the bowl 25 in accordance with the dictates of the operator. The bowl 25 is so constructed that the sponson-ramp structures 30'- '34, 3135 act as fenders to protect the endless tracks 9, 10 from becoming damaged or having their movement interfered with by the earthen load spilling into the bowl- 25 as the tractor 1 moves forward in its loading operation when the apron 16 is in the raised position as shown in FIGURES 5 and 10.

The interior of the bowl has a unique construction Patented Sept. 24, 1963 r g 3 which takes its form from the sponson-ramp structures 3034, 3135 and the lower leveled'flats 43, 44 of the floor and depressed horizontal surface 45 of the floor 17 running longitudinally of the tractor 1, the flats 43, 44 and depressed surface 45 at their forward ends merging to form the downward sloping bowl floor surface or end 36. The scraper edge surface 36 formed by the sponsorsramps 30-34, 31-35, the flats 43, 44 and the depressed surface 45 of the floor 17 all of which merge toforrn the cutting edge 37 presents a full width scraping edge 37 and the dirt or load entering the bowl 25 simultaneously rises up the slope end 36 of the bowl 25 and the ramps 34, 35, some of the dirt entering the bowl area 42 and the rest of the dirt going on the sponsons 30, 31 and falling olf into the area 42 in a swirling action and the dirt or load is retained therein by lowering the apron 16 to the down position as shown in FIGURES 1 through 4 and 6 through 9.

The apron unit 16 is attached to the front end 18 of the tractor 1 by the pair of extensions or arms 46, 47 on either side of the bowl 25 of the vehicle 1 which extensions 46, 47 at their rearward ends are pivotally connected to hydraulic ram units 48, 49 at pivot pins 50, 51 and to pivot pins 52, 53 on the horizontal ledges 54, 55 that are formed integral with the tractor side members 13, 14, the horizontal ledges 54, 55 extending towards the vertical or upright truss members 56, 57 also integral with the tractor side members 13, 14 and .the ram units being attached by pivot pins 58, 59, on the horizontal ledges 54, 55. This type of pivotal connection through operation of the hydraulic ram units 48, 49 permits .the scraper apron unit 16 to be swung vertically in an arcuate path around the forward end 18 of the side members 13, 14 about the pivots 52, 53 from a lower position as shown in FIGURES 1, 2, 3, 4,, 6, 7, 8 and 9 to a raised position as shown in FIGURES and 10. In the lowered position the rearward or inwardly facing concave surface 41 of the apron unit 16 forms a frontal wall or bowl closure for the bowl 25 for holding a load therein and swinging of the apron 16 from the lowered position upwardly permits entrance of a load into the bowl 25- when the tractor 1 is performing scraping operations or the like up to a maximum raised position (see FIGURES 5 and wherein the bowl has its maximum opening. The inside concave faces 60, 61 of the side flanges 62, 63 and the apron 16 have a contour which conforms to and complements the contour of each of the outward facing convex surfaces 64, 65 of the truss elements 56, 57 of side members 13, 14 and the bottom or apron edge 66 of the frontal wall 16 lies adjacent or next to portions 34a, a of the ramps 34, 35 and has extension edge 6611 adjacent the sloping portion 36 of the floor 1-7, the lugs 67, 68 and 69 on the underside or edge 66 of the apron 16 being adjacent the sloping portions 36 of the cutting edge area 37 which extends forwardly beyond the lower cutting edge 66 of the apron unit 16 outside of the bowl unit 25. The weight of the apron 16 actually rests against the downward sloping surfaces 36, 37 of the bowl 25 just rearward of the scraper edge 66 through the lugs or abutments 67, 68 and 69 integral with the lower portion of the apron 16, the central abutment 68 registerable in the slot 70 in the sloping portion 36 and the scraper edge 66a and each of the outer abutments 67, 69 having holes 71, 72 registerable with holes 73, 74 in ears or yoke extensions 75, 76 on the rearward side 77 (when in the dozing positionsee FIGURES 1 and 2) of the lower or depending part 78 of the dozer portion 79 of the apron 16 for holding the depending part 78 fixed to the upper or apron part.80 of the dozer portion 79 of the apron 16 when pins 81 are inserted through the holes 71, 72, 73 and 74 for dozing operation (FIGURES 1 and 2). The dozer apron element 16 is similarly keyed to'extensions 83, 84 on the portions 26, 27 of the side members 13, 14 of the frame 12, the extensions 83, 84 having holes 85, 86 registering with holes 87, 88 on exwithout placing any load on the upper outward facing part of the apron 16 and thus preventing the apron 16 from being pressed against the members 13, 14 avoiding damage to the apron such that the aprons flange surfaces 62, 63 could bind against the surfaces 60, 61 of the forward ends 26, 27 of the side members 13, 14 preventing relative vertical swinging movement between the apron 16 and the side members 13, 14. Also by so locking the dozer 79 to the truss member 56, 57 of side members 13, 14 a shock load can then be withstood.

The outward facing part 80 of the apron 16 of the scraper unit 25 forms the upper part 78a of the dozer unit 79 and is integral with the scraper apron 16. This upper dozer portion 78a carries the swingable member or lower dozer portion 78 which has arms 94, integral therewith, the ends 96, 97 of the arms 94, 95 being pivotally attached tothe outward facing forward section 78a of the apron 16 (i.e. the upper dozer part) intermediate its upper and lower ends thereof at pivots 98, 99 for vertically swingable movement from a lowered or dozing position wherein the dozer blade edge 100 is directed as shown in FIGURES l and 2 to a raised position as shown in FIGURES 3 through 5 and 7 through 10 wherein the outwardly extending dozer blade edge 100 may be locked against the outward facing upper portion 80 of the apron unit 16 by catches 101, 102 attached to the top side of the apron 16. The dozer blade portion 78 may be swung from its lowered position to its raised position by the movement of the ejector gate 28. The dozer portion 78 in its lowered position may be locked as previously mentioned to the apron 16 and in the lowered position of the apron 16 to the side members 13, 14. It will be noticed that the depending portion or lower dozer part 78 of the apron 16 has an outwardly concave surface 107 which when placed in a lowered position forms one continuous concave surface 108 with the outer facing concave surface 109 of the outward upward portion 78a of the apron unit 16 thus forming a moldboard or dozing surface. The concave surface 108 of the dozer unit 79 it will be noted includes the extensions 80a, 80b of the upper dozer portion 78a and the extensions 81a, 81b of the lower dozer portion78, said extensions 80a, 80b, 81a, 81b resulting in the concave dozer surface 108 to extend beyond the tractor width for greater dozing action on external loads.

Soarifying teeth 110, 111 are swingably depending from the backside of the lower dozer portion 78 and are positionable to cut or scan'fy the ground as the tractor 1 moves in a reversed'position in a conventional manner 8 and when the tractor 1 is going in a forwardposition with.

duly strengthened by the thickness of the do zer portion 78 and the thick portion 78a of the apron unit 16, is

capable of knocking over objects such as trees and the like and the apron unit 16 may be vertically swingable in reciprocating hammer-like fashion attendant to knocking over such objects.

Another pair of scarifying teeth 112, 113 depend from the underside 114 of the tractor in such fashion that when the tractor 1 is going rearward the scarifying teeth 112, 113 are extended having their edges soarifying the ground in conjunction with the scarifying teeth 110, 111 on the depending dozer parts 78.

The ejector gate 28 has the pair of rearwardly extending elements 32, 33 carrying horizontal rollers 117, 118 at their rearward end for riding against the inward facing surfaces 121, 122 of the side members 13, 14 and a pair of vertically disposed rollers 123, 124 riding against the undersides of the inwardly projecting top ledges 127, 123 of the side members 13, 14 and a second pairof vertically disposed rollers 125 riding on sponsons 3t), 31 the rollers 117, 118, 123, 124, 125 acting to guide the stabilize the movement of the ejector gate 28 when in motion.

In the scraper operation for tilting of the bowl 25 with a load, the depending part 78 of the dozer 79 is raised toward its locked upper position by the cable 164 (see FIGURE 6) to permit the lower dozer portion 78 with the dozer 79 to be clear of the path of the scraper edge 37 and bowl 25 by the retraction of the ejector gate 28 inwardly within the bowl 25 toward the rear of the tractor 1, final movement of the ejector 28 terminating when it is against the back of the bowl 25 and the depending part 7 8 of the dozer 79 is in the fully raised position with the dozer part 78 held against the front side 80 of the apron 1 at which time the books 101, 102 are then placed over the cutting edge 100 of the dozer depending part 78. Then the apron 16 is gradually opened and swung upward permitting the dirt cut by the scraper edge 37 to enter the bowl 25 and when sufiicient load is placed the bowl 25 the apron 16 may be lowered against the slope portions 34a, 35a such that the apron door 16 has its edge 37 flush against the sloping surface 34a, 35a.

For dozing operations the apron 16 is placed in the downward or closed position as seen in FIGURES l and 2 with the bowl 25 filled with a load or empty. If the.

bowl 25 is filled with a load, the load acts as ballast and gives the tractor 1 a greater capacity for pushing or dozing objects or dirt in its path. If the bowl is empty and the depending part 78 of the dozer 79 is in the raised position the cable 134 may be connected to the dozer blade 1120 and the ejector gate 28 as previously mentioned, and the ejector 28 moves from the rearward to the forward direction lowering the depending part 73 to the down position, as shown in FIGURES 1, 2 and 6 such that the dozer cutting edge 160 is in front of and below the scraper cutting edge 37 to perform m'oldboarding or dozing of the work in front of the tractor 1. If the scraper bowl 25 is filled with a load such that the ejector gate 28 cannot move forward the catches 1111, 102 can be unlatchced and the depending blade portion 78 of a dozer 79 may be allowed to fall in the dozing position so as to present in combination with the upper moldboa-rd surface 80 a complete dozer blade and rnoldboard surface 108 exposed to the load in a manner as accomplished when lowered by the cable 164.

The design of this tractor not only permits its scraper element 25 to scrape the full width of the tractor but the sponson-ramp port-ions 39-64, 31-35 in combination with the bed 17 of the bowl 25 permit the entire forward portion 18 of the tractor 1 to act as a load storing bowl and yet to-protect the endless tracks 9, from being damaged by the load entering the bowl 25. Also when the bowl 25 is filled with material it increases the load working capacity of the tractor 1. Furthermore the forward wall or apron 16 of the tractor 1 serves to enclose the bowl 25 and aid the bowl 25 in being filled by gradual adjustment of the apron opening. The outward facing part 89 of the apron member 16 serves as a dozer blade 79 for pushing loads when the bowl 25 is closed, the

dozer 79 being placed in the out-of-use position when the operator wishes to perform a scraping operation or unload the bowl 25 by ejecting the load with the ejector gate 28 which can raise and lower the dozer blade portion 78 into out-of-use positions. The dozer-apron structure 16 also may be used to strike at loads such as knocking over trees and the like.

Considering the strength characteristics of the frame- Work of the tractor in greater detail it will be noted, as previously mentioned, that each side member 7, 7a comprises a substantially vertical panel 13 or 14 which at its forward end vertically broadens into the truss element 56 or 57 in the form of an enlarged track covering struc- I ture and which includes as a means of reinforcement a truss embossment 130 on its exterior side. The truss embossment 130 has a forwardly bowed compression mem. her 131 which at its upper and lower ends merges into the upper and lower extremities of the forwardly diverging truss struts 132, 13-3 of the tension member 134 of the embossment 130, the rear or inner end of the truss struts 132, 133 merging into a substantially horizontal column member 135 intermediate its ends, the forward end of the columnmember 135 being integrated with the back edge of the compression member 131 at a point substantially medial thereof, the column member 135 extending rearwardly from the apex 136 of the truss embossment 130 over the sponson-ramp or fender structure 36-34 or 3135 which projects laterally and outwardly of the side member 13 or 14. The rear end of the column 135 extends into the forward end of the fore and aft extending box section main beam or horizontal ledge 54 or 55 which forms an edge 137 of the side member 13 or 14, the beam 54 or 55 growing wider rearwardly and merging on its top side with the upright gusset column 133 and at its rear end with the upright gusset column 139. The lower end of the gusset 138 provides a pivotal connection by means of the pin 52 or 53 for the lower rear corner of the extension or boom 46 or 47 which is substantially quadrian-gularly shaped inside elevation and has a pivotal connection at its upper rear corner by the pin 50 or 51 to one end of the ram 48 or 49 extending diagonally downwardly and rearwardly and having a rear end as by the pin 58 or 59 to the ear structure 59a which is forward in a corner which develops between the main beam 54 or 55 and the gusset post 138. The side wall front end portion is also provided with a vertical stiffening rib 139 which extends from the apex 136 of the truss structure 56 or 57 to the upper edge 127 or 128 of the side 7 or 7a.

The forward end of the boom 46 or 47 merges with the guide and positioning plate or apron side flanges 62 or 63 forward on the adjacent lateral edge of the coinbination dozer apron unit 16, the rear edge of the plate 62 or 63 being provided with the wear rail or inside concave face 60 or 61 which could be subjected to sufficient deflection and may react against the forward edge or convex surface 64 and 65 of the compression member 131. However, any load against the outward side of the dozer apron unit 16 is transmitted to the locking extensions 67, 69 and 75, 76 of the upper part 80 of the apron 16 and the dozer depending portion 78, respectively to the extensions 89, of the depending part 78 through to extensions 83, 84 integral with and depending from the truss embossrnent which serves to take up the brunt of the load. Also external loads against the outward side of the apron 16 are transmitted through the boom 46 or 47 to the side 13 or 14 of the vehicle 1 before deflection of the wear rail 60 or 61 can occur.

Having described a novel earthworking vehicle having novel implement means to perform the operations discussed above, the appended claims =follow, wherefore what is claimed is:

1. The combination of a scraper apron and dozer assembly with a scraper bowl and comprising an apron member including a rearwardly disposed door surface having complemental 'bowl closure relation with the scraper bowl, a pivotally depending dozer portion supported by the apron member and having a forwardly facing moldboard surface portion, the apron member having a forwardly disposed moldboard surface portion having complemental alignment with surface portion of the dozer portion and collectively forming a moldboard surface and present-ing a dozer position, said depending portion having first locking means engageable with the apron member rigidify'mg the moldboard portion and having second locking means engageable with scraper bowl in the dozing position and immobilizing the dozer portion relative to the bowl.

2. A vertically swingable scraper apron and dozer asse-mlb-ly for an earth-working vehicle carrying a scraper bowl and comprising an apron member including a rearwardly disposed door surface having complemental bowl open and closure relation with the scraper bowl upon movement of the apron from raised to lowered positions, a depending dozer portion supported by the apron memher and having a forwardly facing moldboard surface portion, the apron member having a forwardly disposed moldboard surface portion having complemental alignment with surface portion of the dozer portion and collectively forming a moldboard surface, said depending portion having a hinged connection with the apron and swingable from a dozing position to a raised position in folded manner against the moldboard surface portion of the apron member, and fastening means on the depending portion holding the dozer portion against the apron member in the raised position.

3. A vertically swingable scraper apron and dozer assembly for an earth-working vehicle carrying a scraper bowl and comprising an apron member including a rearwardly facing door surface having complemental bowl open and closure relation with the scraper bowl upon movement of the assembly from raised to lowered positions, a depending dozer portion pivotally supported by the apron member for relative vertical movement thereto and having a forwardly facing moldboard surface portion, the apron member having a forwardly disposed moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming a moldboard surface, said apron door surface having a concave surface and said forwardly facing moldboard surface having a concave surface in diverging relation to said apron member.

4. The combination of a scraper apron and dozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and swingable vertically from closed to open positions, said apron wall including a rearwardly facing door surface having complemental bowl closure relation with the scraper bowl in the closed position and having a forward portion, a depending dozer portion pivotally supponted in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated apron reinforcing position, said de pending dozer portion having a forwardly facing moldboard surface portion and the forward portion of the apron wall having a forwardly facing moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldboard surface in the lowered dozer position, and locking means operatively connecting the dozer portion with the forward portion of the apron Wall and operative to fold the dozer surface portion against the moldboard surface portion of the forward portion to provide a swingable hammer about the bowl in the open position of the apron wall.

- 5. The combination of scraper apron and dozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and vertically swingable from loweredclosed to raised open positions, said apron wall including a rearwardly facing door surface, a forward portion, a depending dozer portion pivotally supported in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated apron reinforcing position, said depending dozer portion having a forwardly facing mo-ldboard surface portion and the forward portion of the apron wall having a forwardly facing moldboard surface portion having complemental alignment with the surface pontion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldboard surface in the lowered dozer position, and locking means operatively connecting the dozer portion with the forward pontion of the apron wall and operative to fold the dozer surface portion against the moldboard surface portion of the forward portion to provide a swingable hammer about the bowl in the open position of the apron wall, said scraper bowl having a pair of upright walls and a floordefining a scraper opening and said rearwardly facing door surface having peripheral sealing contact with the upright walls and the floor for containing a load within the bowl in the closed position of the apron wall.

6. The combination of a scraper apron and dozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and vertically swingable from lowered closed to raised open positions, said apron wall including a rearwardly facing door surface, a forward portion, a depending dozer portion pivotally supported in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated apron reinforcing position, said depending dozer portion having a forwardly facing moldboard surface portion and the forward Portion of the apron wall having a forwardly facing mold-board surf-ace portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldboard surface in the lowered dozer position, and locking means opcratively connecting the dozer portion with-the forward portion of the apron wall and operative to fold the dozer surface portion against the moldboard surface portion of the forward portion to provide a swingable hammer about the bowl in the open position of the apron wall, said rearwardly facing door surface presenting a concave surface and said :bowl presenting a convex surface providing closed peripheral sealing contact with the door surface of the apron wall for containing a load within the bowl in the closed position of the apron walL' 7. The combination of a scraper apron anddozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and vertically swingable from closed to open positions, said apron wall, including a rearwardly facing door surface, a forward por tion, a depending dozer portion piovtally supported in a.

lowered dozer position bythe forward portion of the apron wall and swing-able from the lowered dozer'posi-. tion to an elevated apron reinforcing position, said depending dozer portion having a forwardly facing moldboard surface portion and the forward portion of the apron wall having a forwardly facing moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldbard surface in the lowered dozer position, and locking means operative-1y connecting the dozer portion with the forward portion of the apron wall and operative to fold the dozer surface portion against the moldboard surface portion of the forward portion to provide a swingable hammerabout the bowl in the open position of the apron wall, said rearwardly facing door surface presenting-a concave surface and said bowl having a convex surface providing closed peripheral sealing contact with the door surface Q part of the apron Wall for containing a load within the bowl in the closed position of the apron wall, said moldboard surface being a forwardly facing concave surface in diverging relation to the concave surface of the rearwardly facing door portion.

8. The combination of a scraper apron and dozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and vertical- 1y swingable from closed to open positions, said apron wall including a rearwardly facing concave door surface and a forward portion, a depending dozer portion pivotally supported in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated apron reinforcing position, said depending dozer portion having a forwardly facing moldboard surface and the forward portion of the apron wall having a forwardly facing rnoldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the Surface portion of the dozer portion a moldboard surface in the lowered dozer position, and locking means operatively connecting the dozer portion with the forward portion of the apron wall and operative to fold the dozer surface portion against the moldboard surface of the forward portion to provide a swingable hammer about the bowl in the open position of the apron wall, said scraper bowl having a pair of upright walls having convex end parts and a floor defining a scraper opening and said rearwardly facing concave door surface having peripheral sealing contact with the convex parts of upright walls and the floor for containing a load within the bowl in the closed position of the apron wall.

9. The combination of a scraper apron and dozer assembly with a scraper bowl and comprising a movable apron wall pivotally connected to said bowl and vertically swingab-le from closed to open positions, said apron wall including a rearwardly facing concave door surface and a forward portion, a depending dozer portion pivotally supported in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated apron reinforcing position, said depending dozer portion having a forwardly facing moldboard surface portion and the forward portion of the apron wall having a forwardly facing moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldboard surface in the lowered dozer position, and locking means operatively connecting the dozer portion with the forward portion of the apron wall and operative to fold the dozer surface portion against the moldbola-rd surface portion of the forward portion to provide a swingable hammer about the bowl in the elevated open position of the apron wall, said scraper bowl having a pair of up right walls having convex end parts and a floor defining a scraper opening and said rearwardly facing door surface having peripheral sealing contact with the convex end parts of the upright walls and the floor for containing a load within the bowl in the closed position of the apron wall, said moldboard surface being a forwardly facing concave surface in diverging relation to the concave surface parts of the rearwardly facing door portion.

10. The combination of a scraper :and dozer assembly with a scraper bowl having a downwardly extending cut ting edge and comprising an apron member including a rearwardly facing door surface having complemental bowl closure relation with the scraper bowl and having a forward portion, a pivotally depending dozer portion supported in a lowered dozer position by the forward portion of the apron member and swingable from the lowered dozer position to an elevated out-of-use position, said depending dozer portion in the lowered position being in work obstruction location of the scraper cutting edge and having a forwardly facing moldboard surface portion, the forward portion of the apron member having a forwardly facing moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a mol-dboard surface in the lowered position of the dozer portion, and holding means opcratively connected between the dozer portion and the forward portion of the apron member and holding the dozer portion in the elevated position and in unobstructing work relation of the scraper cutting edge.

11. The combination of a scraper and dozer assembly with a scraper bowl having upright walls and a floor provided with a forward downwardly extending cutting edge and comprising an apron wall including a rearwardly facing door surface having complemental bowl closure relation with upright walls and the floor of .the scraper bowl and having a forward portion, a pivotally depending dozer portion supported in a lowered dozer position by the forward portion of the apron wall and swingable from the lowered dozer position to an elevated out-of-use position, said depending dozer portion in the lowered position being in planes lying in work obstruction location of the scraper cutting edge and having a forwardly facing moldboard surface portion, the forward portion of the apron wall having a forwardly facing moldboard silrface portion having complemental alignment with the urface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a mo'lidbolard surface in the lowered position of the dozer portion, and holding means operatively connected between the dozer portion and the forward portion of the apron wall and holding the dozer portion in the elevated position and in unobstructing work relation of the scraper cutting edge.

12. The combination of a scraper and dozer assembly with a scraper bowl having a vertically downwardly extending cutting edge extending downwardly below the bowl and comprising an apron member including a rearwardly facing door surface having complemental bowl closure relation with the scraper bowl above the cutting edge and having a forward portion, a pivotally depending dozer portion supported in a lowered dozer position by the forward portion of the apron member and swingable from the lowered dozer position to an elevated out-ofuse position, said depending dozer portion in the lowered position lying in planes that are in work obstruction location of the scraper cutting edge and having a forwardly facing moldboard surface portion, the forward portion of the apron member having a forwardly facing moldboard surface portion having complemental alignment with the surface portion of the dozer portion and collectively forming with the surface portion of the dozer portion a moldboard surface in the lowered position of the dozer portion, and holding means op eratively connected between the dozer portion and the forward portion of the apron member and holding the dozer portion in the elevated position and in unobstructing work relation of the scraper cutting edge.

References Cited in the file of this patent UNITED STATES PATENTS 1,183,850 Bright May 23, 1916 1,472,580 Bressler Oct. 30, 1923 2,311,639 Click Feb. 23, 1943 2,312,390 Cordes Mar. 2, 1943 2,433,019 Arps Dec. 23, 1947 2,513,700 Wood July 4, 1950 2,841,894 Valois July 8, 1958 2,883,772 Dodge Apr. 28, 1959 FOREIGN PATENTS 1,248,265 France Oct. 31, 1960 

1. THE COMBINATION OF A SCRAPER APRON AND DOZER ASSEMBLY WITH A SCRAPER BOWL AND COMPRISING AN APRON MEMBER INCLUDING A REARWARDLY DISPOSED DOOR SURFACE HAVING COMPLEMENTAL BOWL CLOSURE RELATION WITH THE SCRAPER BOWL, A PIVOTALLY DEPENDING DOZER PORTION SUPPORTED BY THE APRON MEMBER AND HAVING A FORWARDLY FACING MOLDBOARD SURFACE PORTION, THE APRON MEMBER HAVING A FORWARDLY DISPOSED MOLDBOARD SURFACE PORTION HAVING COMPLEMENTAL ALIGNMENT WITH SURFACE PORTION OF THE DOZER PORTION AND COLLECTIVELY FORMING A MOLDBOARD SURFACE AND PRESENTING A DOZER POSITION, SAID DEPENDING PORTION HAVING FIRST LOCKING MEANS ENGAGEABLE WITH THE APRON MEMBER RIGIDIFYING THE MOLDBOARD PORTION AND HAVING SECOND LOCKING MEANS ENGAGEABLE WITH SCRAPER BOWL IN THE DOZING POSITION AND IMMOBILIZING THE DOZER PORTION RELATIVE TO THE BOWL. 